Mounting for cutters of rotary well-drilling disk bits



Sept. 18, 1928. 1,684,462

w. T. wooDs 7 Filed Oct. 24, 1927 25 ferred for 1 of the well drilling bit.

vided between the cutters a Patented Sept. 18, 1928.

UNITED STATES PATENT orifice.

WALTER r. woozos, or LONG BEACH, cALIronNIA'fAssIeNoR TO U. s. roonop- IiANY, or LONG BEACH, CALIFORNIA, A CORPORATION or oALIroRNIA.

MOUNTING FOR CUTTERS 0F ROTARY WELL-DRILLING DISK IBI'IS Application filed October 24, 1927. Serial No. 228,206.

This invention relates to the rotary well drilling bit of the type employed in the hydraulic rotary system of drilling wells. The disk bits employed in the hydraulic rotary system of drilling wells have a tendency to lose one, or more, of the rotary cutters for the bit during drilling operations, unless the disk cutters are very securely mounted upon the bit body. An ob ect of the present invention is to provide an effective mounting for the disk cutters of the bit which will substantially reduce the danger of the cutters from being lost from the bit.

Various-further objects and advantages of the invention will be apparent from the description of the preferred form, for example the disk bit embodying the invention. For this purpose reference is made to the accompanying drawings in which one form, for example, of a disk bit embodying the invention, is shown.

In the drawings:

Fig.1 i a vertical elevation of the pre- Fig. 2 is an enlarged elevation at right angles to Fig. 1 ofthe lower portion ofthe bit.

Fig. 3 is an enlarged fragmentary View of one of the disk cutters mounting means and a portion of "the bit body or leg. I

Fig. 4 is an end view of the mounting means.

Referring to the drawings, the well bit there illustrated comprises an elongated body 1, having an enlargement 2 near ts upper end, and terminatingin a tapered pm 3, by means of which the bit may be attached to a stand and drill pipe and rotated during the drilling operations. The body 1 is providedpwith opposed legs 4 extending below the major portion of the body, the legs 4 being bent forwardly in the direction of rotation of the bit and preferably parallel, as more clearly indicatedin Fig. 2.

Each leg serves to support or mount a disk cutter 5. The cutters are supported on the inner sides of the legs so that they are disposed between the legs, and the legs are sufficiently spaced apart so that there is prosubstantial space through which the mud or detritus cut by There is provided an 7 through the body for conveying flushing fluid from the supporting drilling pipe and discharge the same into the space between the legs, where it may admix with the detritus and aid in disintegrating and forming a mud fluid with the same.

supporting leg in a similar manner and,

ence, only one of the mountings will be described. Themountings include a pin 10, part of which is inserted in the legs 4 and the other part extending outwardly from the legs. The latter part 12 is screw threaded and the inner part 11 of the pin is provided with a head 13. The leg 4 has an opening therein 14, fitting the portion 11 of the pin 10. and an enlarged opening 15 for receiving the head 13 of the pin 10. There is also provided a radial extension 16 of the opening 1? in the head of the, pin 10 for locking the pin against rotation.

n the inner side of the leg 4 there is provided a combined washer and load transferring member 18 which is threadedto the portion 12 of the pin and is fitted in a recess 19 in the inner face of theleg 4, said load transferring member 18 is in 'as indicated at 20, to receive and fit the end of a bushing 21 which has a bearing portion 22 mounting a disk cutter 5. The bushing 21 also has a head 23 adapted to engage the cutter to hold the same on'the bushing. The pln is threaded to the bushing 21. The pin 10 is also provided with an opening 24 for receiving a cotter pin and this pin passes through one of a pair of diagonal notches 26 in the head of the bushing. A number of pairs of such diagonally oppositely placed notches are provided in the head of the bushing in order that the cotter pin may be inserted in various desired positions.

By the mounting thus described the load on the disk cutters 5 is transferred first .to the bushing 21 and said bushing in turn transfers the load to the load transferring member or washer 18, which in turn trans fers the load to the leg 4. In this Way most of the load on the pin 10 is removed. An important feature of the invention is the use of the bushing 21 fitting in a recess in 'a washer 19 so that the bushing 21 is held for engagement with the leg 4, By this Each of the disks 5 is mounted upon its 15 which receives a pin turn recessed,

construction the tendenc of the end of the bushing to work into t e leg, experienced in certain prior mountin s, is eliminated and the wear is received by the washer 1 8 which may be made of harder material than the le 4 and which may also be readily replace While the particular form of the invention herein described is well adapted'to accomplish the object-s,'purposes and advantages of the invention, it is understood that various modifications, changes and substitutions may be made without departing from the invention, and the invention includes all such modifications, changes and substitutions as come within the scope of the ap-' pended claims.

I claim:

1. A rotary well drilling bit comprising a body, an opening through the bod a pin extending through said opening, a ushmg mounted upon said pin, a disk cutter carried by'said bushing, a washer between said disk cutter and body, said washer having a recess therein fitting the engaging end of the bushing.

2, A rotary well drilling bit comprising a 'body having an openin therethrough, a pin extending through sai opening, a bushinomounted on saidpin and provided with a ead, a disk cutter revolvably mounted upon said bushing, a washer between said disc cutter and the body, said bushing hav ing its end engagin said washer and fitted into a recess in sai washer.

3. A rotary well drilling bit comprising a body, a pin supported by the body, a bushing mounted upon the pin, a disk cutter sup ported by'the bushing, a washer between the disk cutter and body, said washer being disposed within a recess in said bod so as to transfer part of the load from the isk cutter to the body,

thereby reducing the load upon rotation, wlth respect to the body, and means for locking the bushing from rotating with respect to said pin.

5. A rotary disk cutter comprising a body having an opening thcrethrough, a pin ex tending through said opening, a bushing mounted on said pin and head, a disc cutter revolvab y mounted u on said bushing, a washer between said isk cutter and the body, said bushin having its end engaging said washer and fitted into a recess in said washer, means for locking the pin against rotation, with respect to the body, and means for locking the bushing from rotatingwith respect to said pin.

6. A rotary disk cutter comprising a body, a pin supported by the body, a bushing mounted upon the pin, a disk cutter supported by the bushing, a washer between the disk cutter and body, said washer being already disposed within a recess in said body so as to transfer part of the load from the disk cutter to the body, thereby reducing the load upon the pin, the bushing having one end fitted in a recess in said washer, means for locking the pin against rotation, with respect to the body, and means for locking the bushing from rotating with rcspect to said pin.

Signed at Los Angeles, Calif., this 18th day of Oct. 1927.

WALTER T. woons.

rovlded with a 

